linux-kernel - arch/powerpc/crypto/aes-gcm-p10-glue.c:121:9: error: 'gcm_init_htable' accessing 256 bytes in a region of size 224

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Date:   Sun, 29 Oct 2023 00:54:22 +0800
From:   kernel test robot <lkp@...el.com>
To:     Danny Tsen <dtsen@...ux.ibm.com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: arch/powerpc/crypto/aes-gcm-p10-glue.c:121:9: error:
 'gcm_init_htable' accessing 256 bytes in a region of size 224

Hi Danny,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   56567a20b22bdbf85c3e55eee3bf2bd23fa2f108
commit: 9c716e1bd369afa2d1c5038297e8ceda3f82db7d crypto: p10-aes-gcm - Remove POWER10_CPU dependency
date:   6 months ago
config: powerpc64-randconfig-r005-20230913 (https://download.01.org/0day-ci/archive/20231029/202310290004.TQsw1iN1-lkp@intel.com/config)
compiler: powerpc64le-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231029/202310290004.TQsw1iN1-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310290004.TQsw1iN1-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/powerpc/crypto/aes-gcm-p10-glue.c: In function 'gcmp10_init':
>> arch/powerpc/crypto/aes-gcm-p10-glue.c:121:9: error: 'gcm_init_htable' accessing 256 bytes in a region of size 224 [-Werror=stringop-overflow=]
     121 |         gcm_init_htable(hash->Htable+32, hash->H);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/crypto/aes-gcm-p10-glue.c:121:9: note: referencing argument 1 of type 'unsigned char[256]'
   arch/powerpc/crypto/aes-gcm-p10-glue.c:121:9: note: referencing argument 2 of type 'unsigned char[16]'
   arch/powerpc/crypto/aes-gcm-p10-glue.c:41:17: note: in a call to function 'gcm_init_htable'
      41 | asmlinkage void gcm_init_htable(unsigned char htable[256], unsigned char Xi[16]);
         |                 ^~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/gcm_init_htable +121 arch/powerpc/crypto/aes-gcm-p10-glue.c

cdcecfd9991fe9a Danny Tsen 2023-02-20  113  
cdcecfd9991fe9a Danny Tsen 2023-02-20  114  static void gcmp10_init(struct gcm_ctx *gctx, u8 *iv, unsigned char *rdkey,
cdcecfd9991fe9a Danny Tsen 2023-02-20  115  			struct Hash_ctx *hash, u8 *assoc, unsigned int assoclen)
cdcecfd9991fe9a Danny Tsen 2023-02-20  116  {
cdcecfd9991fe9a Danny Tsen 2023-02-20  117  	__be32 counter = cpu_to_be32(1);
cdcecfd9991fe9a Danny Tsen 2023-02-20  118  
cdcecfd9991fe9a Danny Tsen 2023-02-20  119  	aes_p8_encrypt(hash->H, hash->H, rdkey);
cdcecfd9991fe9a Danny Tsen 2023-02-20  120  	set_subkey(hash->H);
cdcecfd9991fe9a Danny Tsen 2023-02-20 @121  	gcm_init_htable(hash->Htable+32, hash->H);
cdcecfd9991fe9a Danny Tsen 2023-02-20  122  
cdcecfd9991fe9a Danny Tsen 2023-02-20  123  	*((__be32 *)(iv+12)) = counter;
cdcecfd9991fe9a Danny Tsen 2023-02-20  124  
cdcecfd9991fe9a Danny Tsen 2023-02-20  125  	gctx->Plen = 0;
cdcecfd9991fe9a Danny Tsen 2023-02-20  126  
cdcecfd9991fe9a Danny Tsen 2023-02-20  127  	/*
cdcecfd9991fe9a Danny Tsen 2023-02-20  128  	 * Encrypt counter vector as iv tag and increment counter.
cdcecfd9991fe9a Danny Tsen 2023-02-20  129  	 */
cdcecfd9991fe9a Danny Tsen 2023-02-20  130  	aes_p8_encrypt(iv, gctx->ivtag, rdkey);
cdcecfd9991fe9a Danny Tsen 2023-02-20  131  
cdcecfd9991fe9a Danny Tsen 2023-02-20  132  	counter = cpu_to_be32(2);
cdcecfd9991fe9a Danny Tsen 2023-02-20  133  	*((__be32 *)(iv+12)) = counter;
cdcecfd9991fe9a Danny Tsen 2023-02-20  134  	memcpy(gctx->iv, iv, 16);
cdcecfd9991fe9a Danny Tsen 2023-02-20  135  
cdcecfd9991fe9a Danny Tsen 2023-02-20  136  	gctx->aadLen = assoclen;
cdcecfd9991fe9a Danny Tsen 2023-02-20  137  	memset(gctx->aad_hash, 0, 16);
cdcecfd9991fe9a Danny Tsen 2023-02-20  138  	if (assoclen)
cdcecfd9991fe9a Danny Tsen 2023-02-20  139  		set_aad(gctx, hash, assoc, assoclen);
cdcecfd9991fe9a Danny Tsen 2023-02-20  140  }
cdcecfd9991fe9a Danny Tsen 2023-02-20  141  

:::::: The code at line 121 was first introduced by commit
:::::: cdcecfd9991fe9aac8160a9731b0ffd1e702d19d crypto: p10-aes-gcm - Glue code for AES/GCM stitched implementation

:::::: TO: Danny Tsen <dtsen@...ux.ibm.com>
:::::: CC: Herbert Xu <herbert@...dor.apana.org.au>

-- 
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https://github.com/intel/lkp-tests/wiki